Pool Rules Sign (18 x 24 Inches on White Styrene Plastic) (Version B) Signs are printed on .040 white styrene which is a high impact polystyrene hard plastic material. All four corners of our plastic signs are pre-drilled with 1/4 inch grommets pre-installed for easy mounting. Meets various state codes but not all! These signs are not recommended for high wind environments. Recommended for mounting on walls or other flat surface mounting.